javascript - Cannot get all possible overlapping regular expression matches -

i have string

started: 11.11.2014 11:19:28.376<br/>ended: 1.1.4<br/>1:9:8.378<br/>request took: 0:0:0.2 

i need add zeros in case encounter 1:1:8 should 01:01:08 same goes date. tried using

/((:|\.|\s)[0-9](:|\.))/g 

but did not give possible overlapping matches. how fix it?

var str = "started: 11.11.2014 11:19:28.376<br/>ended: 11.11.2014<br/>11:19:28.378<br/>request took: 0:0:0.2";  var re = /((:|\.|\s)[0-9](:|\.))/g while ((match = re.exec(str)) != null) {     //alert("match found @ " + match.index);     str =  [str.slice(0,match.index), '0', str.slice(match.index+1,str.length)];   }         alert(str); 

this want:

str.replace(/\b\d\b/g, "0$&") 

it searches lone digits \d, , pad 0 in front.

the first word boundary \b checks there no [a-za-z0-9_] in front, , second checks there no [a-za-z0-9_] behind digit.

$& in replacement string refers whole match.

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if want pad 0 long character before , after not digits:

str.replace(/(^|\d)(\d)(?!\d)/g, "$10$2")